WO2018059721A1 - Développement d'encre - Google Patents

Développement d'encre Download PDF

Info

Publication number
WO2018059721A1
WO2018059721A1 PCT/EP2016/073528 EP2016073528W WO2018059721A1 WO 2018059721 A1 WO2018059721 A1 WO 2018059721A1 EP 2016073528 W EP2016073528 W EP 2016073528W WO 2018059721 A1 WO2018059721 A1 WO 2018059721A1
Authority
WO
WIPO (PCT)
Prior art keywords
ink
image
developer roller
photoreceptor
printed
Prior art date
Application number
PCT/EP2016/073528
Other languages
English (en)
Inventor
Asaf Shoshani
Lavi Cohen
Ido FINKELMAN
Meir GRINSTEIN
Original Assignee
Hp Indigo B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hp Indigo B.V. filed Critical Hp Indigo B.V.
Priority to CN201680089758.4A priority Critical patent/CN109791387B/zh
Priority to PCT/EP2016/073528 priority patent/WO2018059721A1/fr
Priority to US16/332,965 priority patent/US10649380B2/en
Publication of WO2018059721A1 publication Critical patent/WO2018059721A1/fr
Priority to US16/776,811 priority patent/US10802435B2/en

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
    • G03G15/104—Preparing, mixing, transporting or dispensing developer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6588—Apparatus which relate to the handling of copy material characterised by the copy material, e.g. postcards, large copies, multi-layered materials, coloured sheet material
    • G03G15/6594—Apparatus which relate to the handling of copy material characterised by the copy material, e.g. postcards, large copies, multi-layered materials, coloured sheet material characterised by the format or the thickness, e.g. endless forms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/80—Details relating to power supplies, circuits boards, electrical connections

Definitions

  • digital offset presses may rely on ink development for transferring ink to an intermediate unit, such as a photoreceptor.
  • An ink developer may comprise a developer roller which may transfer ink by contacting the intermediate unit.
  • Fig. 1 shows a print system according to an example.
  • FIG. 2 shows a developer unit according to an example.
  • FIG. 3 shows a method according to an example.
  • FIG. 4 shows a method according to an example.
  • Figs. 5a-5c show sequences of a method according to an example.
  • Fig. 6 shows a print according to an example.
  • FIG. 7 shows a method according to an example.
  • Fig. 8 shows a print according to an example.
  • FIG. 9 shows a method according to an example.
  • FIG. 10 shows a method according to an example.
  • Fig. 1 1 shows a method according to an example.
  • Fig. 12 shows a computer system according to an example.
  • examples are mainly directed to printing systems and methods, e.g., using electrophotographic printers or digital presses.
  • Fig. 1 shows an example of print system 100, which may be a digital offset press, e.g., a liquid toner electrophotographic printer (LEP).
  • the print system 100 may comprise a print controller 1 10.
  • the print controller 1 10 may manage the print of images.
  • the print controller 1 10 may receive commands and data 108 from a user, e.g., through a typographical application.
  • the user may also be remote, e.g., connected thorough a geographical network.
  • the print controller 1 10 may also provide feedback (e.g., notifications or alarms) 1 16, e.g., to the user.
  • the print system 100 may include a photo imaging component, such as a photoreceptor (image plate) 1 12, which may be mounted on a photoreceptor/imaging drum/cylinder 1 14.
  • the photoreceptor 1 2 may define an outer surface of the imaging drum 1 14 on which images are formed.
  • a charging component such as charge roller 125 connected to electrical power units (not shown) may generate electrical charge that flows toward the photoreceptor surface and cover it with a uniform electrostatic charge.
  • a laser imaging unit (writing head) 1 18 may selectively expose the photoreceptor 1 12 with a laser beam 1 19, in particular exposing image areas on the photoreceptor 1 12 and dissipating (neutralizing) the charge in some areas. Exposure of the photoreceptor 1 12 in this manner creates a "latent image" in the form of an invisible electrostatic charge pattern that replicates the image to be printed.
  • the image may be developed by binary ink developers (BIDs) 122a, 122b, 122c, and 122d, to form an ink image on the outer surface of the photoreceptor 1 12.
  • BIDs binary ink developers
  • Each BID may develop one ink color of the image, and each developed color may correspond with one image impression or color separation. While four BIDs are shown, indicating a four color process (i.e., a CMYK process based on Cyan, Magenta, Yellow, and Black colors), other implementations may include different BIDs corresponding to additional colors.
  • a single color separation impression of the ink image developed on the photoreceptor 1 12 may be transferred from the photoreceptor 12 to an image transfer blanket 124.
  • the image transfer blanket 124 may be wrapped around and securely fastened to the outer surface of an intermediate transfer member (ITM) drum 126.
  • ITM intermediate transfer member
  • the first image transfer that transfers ink from the photoreceptor 1 12 to the print blanket 124 is driven by an applied mechanical pressure between the imaging drum 1 14 and the ITM drum 126, and electrophoresis of the electrically charged ink particles.
  • the electric field that drives the ink transfer may be created by a bias voltage applied to the print blanket 124.
  • the print blanket 124 may be heated by both internal and external heating sources such as infrared heating lamps (not shown), e.g., under the control of the print controller 1 10.
  • the heated print blanket 124 may cause most of the carrier liquid and solvents in the transferred ink image to evaporate.
  • the heated blanket 124 may also cause particles in the ink to partially melt and blend together. This results in a finished ink image on the blanket 124 in the form of a hot, nearly dry, tacky plastic ink film.
  • the hot ink film image impression may be transferred from the blanket 124 to a substrate 127 such as a sheet of print media (e.g., paper).
  • the substrate 127 may be held or supported by an impression (IMP) drum/cylinder 128.
  • IMP impression
  • Contact pressure between the ITM drum 126 and IMP drum 128 may compress the blanket 124 against the substrate 127 to facilitate the transfer of the hot ink film image.
  • the temperature of the substrate 127 is below the melting temperature of the ink particles, and as the ITM drum 126 and IMP drum 128 rotate against one another under pressure, the hot ink film comes into contact with the cooler substrate 127 and causes the ink film to solidify and peel off from the blanket 124 onto the substrate 127.
  • the substrate 127 may be fed in the direction of the length of the substrate 127, which may be along a feeding direction (print direction) F, Rollers 132 and 133 and/or the IMP drum 128 may be used for feeding. Motor units, which may be controlled by the print controller 1 10, may be used to drive the movements.
  • an intermediate transfer member may be avoided, and ink is directly transferred from the photoreceptor 1 12 to the substrate.
  • the process may be repeated for each color separation in the image.
  • the colors accumulate in successive revolutions on the substrate 127 wrapped on the IMP drum 128 until all the color separation impressions (e.g., C, M, Y, and K) in the image are transferred to the substrate 127.
  • Elements such as the laser imaging unit 1 18, the BIDs, and the electric devices which control the printing voltages applied to the BIDs may be controlled by the print controller 1 10.
  • motor units which drive the rotation of at least some of the imaging drum 1 14, the ITM drum 126, and IMP drum 128 may be controlled by the print controller 1 10.
  • the print controller 1 10 may perform a timing of a development cycle of a binary ink developer, BID, on the basis of the length of the substrate 127 or the size of the image or the area to be printed with the ink associated to the BID.
  • FIG. 2 is a schematic view illustrating a BID assembly 200, which may constitute one of BIDs 122a-122d.
  • the BID assembly 200 may include a developer roller 210.
  • the developer roller 210 may be in contact with the photoreceptor 1 12 (e.g., at location 204) for transferring ink to the photoreceptor 1 12. It is possible to selectively engage/disengage the developer roller 210 with/from the photoreceptor 1 2. For example, when a particular colorant is to be applied to a substrate, a BID associated to the particular colorant is engaged to the photoreceptor, while the other BIDs are disengaged from the photoreceptor.
  • the developer roller 210 may be a rotatable float element which rotates by virtue of the rotation of the imaging drum 1 14, when the BID assembly 200 and the imaging drum 1 14 are connected to each other. In Fig. 2, the developer roller 210 rotates in clockwise direction.
  • the BID assembly 200 may include at least one electrode, e.g., the electrode 21 1 , which may create potential bias, to transfer ink particles to the developer roller 210.
  • Ink may be liquid ink, for example, or solid ink, or a mixture of liquid and solid ink particles.
  • the ink particles may be electrically charged, e.g., negatively charged or positively charged, according to the type of ink and the charge of the electrode 21 1.
  • the distal end of the electrode 21 1 may protrude towards the developer roller 210 in correspondence with location 201 in Fig. 2.
  • the BID assembly 200 may include a squeegee roller 212.
  • the squeegee roller 212 may include a squeegee roller 212.
  • the squeegee roller 212 may regulate the film thickness of the ink on the developer roller 210.
  • Numeral 202 indicates the contact region between the squeegee roller 212 and the developer roller 210.
  • the squeegee roller 212 may be a rotatable float element whose rotation is driven by the rotation of the developer roller 210.
  • the squeegee roller 212 may have a diameter which is less than a half of that of the developer roller 210.
  • the BID assembly 200 may include a cleaner roller 213.
  • the cleaner roller 213 may be in contact with the developer roller 210 and a wiper (not shown).
  • the cleaner roller 213 may rotate to clean the developer roller 210. Accordingly, unused ink (i.e., ink which has not been transferred to the photoreceptor 1 12) may be removed from the developer roller 210.
  • Numeral 203 indicates the contact region between the cleaner roller
  • the cleaner roller 213 may be a rotatable float element which is rotated by virtue of the rotation of the developer roller 210.
  • numeral 214 refers to a layer of ink which has been placed on the surface of the developer roller 210 and which is transferred to the photoreceptor 1 12 at location 204.
  • ink is transferred to the lateral surface of the developer roller 210 between locations 201 and 202.
  • the majority of ink arrives from the position 201 corresponding to the electrode 21 1
  • the minority of ink arrives from the position 202 corresponding to the squeegee 212.
  • Ink is subsequently moved to the photoreceptor 1 12 in correspondence with location 204.
  • At least some of these elements may be electrically charged so as to perform an electrostatic transfer of ink.
  • the differences of potential between different elements may determine movements of charged ink particles.
  • the difference of potential between the developer roller 210 and the photoreceptor 1 12 may cause selective transfer of the layer of toner particles to the photoreceptor 1 12.
  • Fig. 2 also shows electrical connections between elements of the BID and a power supply (PS) 250.
  • the PS 250 may be controlled by the print controller 1 10.
  • the PS 250 may control at least one of the developer roller 210, the electrode 21 1 , the squeegee roller 212, and the cleaning roller 213.
  • the control may be such that an electrical value associated to at least one element of the BID assembly 200 is imposed to an element 210, 21 1 , 212, or 213.
  • the control may be such that a voltage of at least one element of the BID assembly 200 may be controlled, at least during some time slots.
  • the control may be such that a voltage of at least one element of the BID assembly 200 may be floating, for example during some time slots which are not the time slots in which the voltage is imposed.
  • the PS 250 may control the timing of the elements and the electric variables of at least some of the elements of the BID.
  • the power supply 250 may contain at least one rectifier (e.g., one for each of the controlled elements).
  • the power supply 250 may contain at least one inverter, a chopper, a buck-boost converter, or similar.
  • the inverter and/or the rectifiers may comprise a combination of silicon-based power switches.
  • the inverter and/or the rectifiers may comprise a combination of diodes, bipolar junction transistors (BJTs), metal-oxide-semiconductor field-effect transistors (MOSFETs), thyristors, and in particular gate turn-off thyristors (GTOs).
  • the power supply 250 may also comprise or be connected to a filter and/or linear element, such as a capacitor or an inductor.
  • the power supply 250 may also be supplied by a mains, e.g. a monophase or threephase mains.
  • the power supply 250 may also comprise or be connected to elements such as a transformer or an auto-transformer, e.g. , for modifying the supply voltage.
  • the power supply 250 may be localized in correspondence with the BID assembly 200.
  • the power supply 250 may be remote from of the BID assembly 200. Some elements of the power supply 250 may be spatially distributed.
  • the power supply (or at least a part of it) may be centralized for all the BIDs 122a-122d. Alternatively, each BID 122a-122d may have its independent own PS.
  • a communication network or another king of logical link between the PS and, in case, a control logic may also be provided.
  • the PS may be controlled by the print controller 1 10 or by a dedicated logic element, such as a processor, controller, digital signal processor (DSP), which in turn may be commanded by the print controller 1 10.
  • DSP digital signal processor
  • the PS may be synchronized to the motor unit moving the imaging drum 1 14 so as the mutual rotation of the imaging drum 1 14 and the developer roller 210 is controlled.
  • the BID assembly 200 may be either mechanically engaged to the photoreceptor 1 12 or disengaged from the photoreceptor 1 12.
  • a mechanical engaging unit (not shown), which may be controlled by the print controller 10, may force the movement of the BID.
  • the developer roller 210 In an engaged position, the developer roller 210 may be in contact with the photoreceptor 1 2 so as to permit transfer of ink to the photoreceptor 1 12.
  • Fig. 3 shows a method 300 for performing a BID cycle.
  • the PS 250 may be turned on for a chosen BID.
  • voltages may be imposed to at least one of the developer roller 210, the electrode 21 1 , the squeegee roller 212, and the cleaning roller 213.
  • the BID may be mechanically engaged to the imaging drum, e.g., by touching the photoreceptor 1 12.
  • ink may be selectively developed onto the photoreceptor 1 2, while the imaging drum 1 14 rotates, so as to impinge the photoreceptor 1 12 with ink in accordance to the electrostatic charge pattern created by the laser beam 1 19.
  • the PS 250 may be shut off and the chosen BID may be disengaged.
  • Fig. 4 shows a method 420 for performing a print operation.
  • an image to be printed may be divided into a plurality of color separations.
  • a color separation could be associated to a colorant, which may be, for example, Cyan, Magenta, Yellow, and Black.
  • an associated print area may be calculated.
  • the print area may comprise the dots or pixels which are to be represented in the printed image by transferring a particular ink in the positions associated to the pixels.
  • a pixel may be represented by superposing a plurality of different colorants in the same position.
  • Block 422 may be implemented, for example, by performing a control by a routine in the print controller 1 10.
  • an upper margin may be defined for performing the print.
  • an upper margin of the page (or the print frame that has to be printed) may be defined.
  • an upper margin of the image may be defined.
  • the upper margin of the image could be the first line that is to be printed within the page (or frame).
  • An upper margin of the print area of the color separation may be defined. If, for example, a colorant is to be placed in the last lines of the page, the upper margin for that colorant may be one of the last lines of the page.
  • a lower margin may be defined.
  • a lower margin of the page or print frame
  • a lower margin of the image to be printed may be defined.
  • a lower margin of the print area of the color separation may be defined. If, for example, a colorant is to be placed in the first lines of the page to be printed, the upper margin for that colorant may be one of the first lines of the page.
  • the upper/lower margins are defined in the page or in the print frame of the substrate 127. However, corresponding upper/lower margins are also defined in the latent image on the photoreceptor 1 12.
  • Block 424 may be executed by the print controller 1 10. In case the definition of the upper and/or lower margins is not based on the particular color separation, block 424 may also precede block 422 or may be executed in parallel to block 422, in some examples.
  • a first BID may be selected. The BID may be associated to one of the color separations. For example, when Black is to be printed, the BID containing Black colorant is chosen.
  • the method 300 may be performed.
  • the print may be performed starting from the upper margin defined in block 424.
  • the substrate 127 may be, for example, transported towards the upper margin.
  • the BID cycle defined by method 300 may be synchronized to the upper margin: the PS 250 may be turned on for preparing the start of ink transfer in correspondence with the upper margin. Additionally or alternatively, the developer roller 210 may be engaged to the photoreceptor 1 12 so as to start impinging ink onto the photoreceptor 1 12 (and subsequently onto the substrate 127) from the upper margin.
  • the mechanical engagement between the developer roller 210 and the photoreceptor 1 12 is performed to prepare the deposition of ink starting from the upper margin.
  • No physical contact between the developer roller 210 and the photoreceptor 1 12 may be provided in correspondence with portions of the photoreceptor associated to regions which, in the substrate 127, are before the upper margin.
  • the print may end at the lower margin defined in block 424.
  • the BID cycle may therefore be synchronized to arrive at the lower margin: the PS 250 may be shut off in correspondence with the lower margin.
  • the last ink particles of the ink layer 214 may arrive at position 204 exactly when the lower margin of the printed image is formed in the photoreceptor 1 12.
  • the developer roller 210 may carry no ink layer. The developer roller 210 may be disengaged from the photoreceptor 1 12 so as to avoid contact between the developer roller 210 and the photoreceptor 1 12.
  • an ink layer (e.g., ink layer 214 in Fig. 2) is present on the surface of the developer roller 210 until the lower limit is reached.
  • Block 430 it is determined if an additional BID is needed, e.g., to apply a colorant which has not been transferred to the substrate 127. If the print job is completed, the method ends at block 432. A new print job may be prepared, whose print may follow the same or a similar procedure. Block 430 may be avoided in some cases, e.g., when performing a monochromatic print using only one single ink developer.
  • the additional BID is selected at block 434, e.g., in association to another color separation defined at block 422.
  • the upper and/or the lower margin for the additional BID are the same of the upper and/or the lower margin for the preceding BID.
  • the upper margin or the lower margin for the additional BID may be in general different from the upper margin or the lower margin for the first BID, as a consequence of the different disposition of the colors in the image. Accordingly, the method 420 may be performed for the time in which a particular area is printed and, therefore, the BID is used when appropriate.
  • Iterations between blocks 428, 430, and 434 may therefore be defined. The iterations may end when all the inks have been applied to the substrate 127 and the print job is completed.
  • FIG. 5a-5c A conceptual example may be derived by Figs. 5a-5c, in which an Italian flag (which has three adjacent bands respectively Green, White, and Red and is represented in Fig. 5c) is to be printed in the print direction F (e.g., from left to right in Figs. 5a-5c), by a printer having at least Red and Green BIDs, on an originally white substrate 500. Accordingly, at block 422 the image is broken into a Green color separation and a Red color separation. The margins defined at block 424 are to correspond to the margins of the flag's bands 502, 504, and 506. During a first iteration of method 420, at block 428 the Green band 502 is printed along the direction F between upper margin 502a and lower margin 502b.
  • a Green BID is engaged to the photoreceptor for transferring Green colorant to the substrate 500 in correspondence with the band 502 to be printed.
  • the PS for the Green BID may be shut off. Accordingly, the BID cycle is approximately 33.33% with respect to the length of the substrate 500.
  • the Red BID is selected at block 434.
  • the BID cycle is defined at block 428 between upper and lower margins 504a and 504b. Even in this case, the BID cycle for the Red ink is approximately the 33.33% with respect to the length of the substrate 500. Mechanical engagement of the BID with the photoreceptor is not carried out and the PS is off when the margin 504a is not reached.
  • Fig. 6 shows parts of an image 602 printed on a substrate 600.
  • the image may be printed in the print direction F between an upper margin 602a and a lower margin 602b.
  • the BID assembly 200 may be used.
  • Fig. 6 also shows a line 602c intermediate to the margins 602a and 602b.
  • the line 602c and the lower margin 602b define a final portion 604 of the image 602.
  • the image length may be 515 mm, for example.
  • angular values shown in the following Table 1 and an angular velocity of 3.6 ms for the developer roller 210 the following values may be obtained:
  • the angle between locations 202 and 204 (which in the present numerical example is 137.6°) may be rotated in 37.84 ms, which may approximate 35 ms.
  • This angle corresponds to the maximum value of the arc of the developer roller 210 on which ink layer 214 is deposited (Fig. 2) from the squeegee roller 212 to the contact point 204 of the developer roller 210 with the photoreceptor. That ink is used to print the final portion 604 of image 602 (between the intermediate line 602c and the lower margin 602b).
  • a BID cycle e.g., defined by a method 300' shown in Fig. 7, which may comprise a block 302 analogous to the block 302 of method 300 of Fig. 3.
  • Method 300' may also comprise a sequence of blocks which may correspond to block 304 of method 300.
  • ink may be developed onto the photoreceptor 1 12 until a shut-off time limit.
  • the shut-off time limit may correspond, for example, to the instant during which the intermediate line 602c is formed in the photoreceptor 1 12.
  • the remaining ink 214 (visible in Fig. 2) is transferred to the photoreceptor 1 12 while the developer roller 210 describes an angle between locations 202 and 204 (which in case of Table 1 is 137.6°) and the PS is shutting off.
  • the shut- off time limit is such that ink 214, remaining in the developer roller 210, may still be applied to the photoreceptor 1 12 while the PS is turning off. Therefore, when the lower margin of a print area is calculated, it is also possible to calculate the shut-off time limit by taking into account the position of the lower margin, structural parameters, and velocity values of the developer roller. In particular, by shutting off the electrode 21 1 while the final portion 604 of the image 602 is still being formed in the photoreceptor 1 12 without shutting off the developer roller 210, the transfer of the last particles of ink to the photoreceptor 1 12 may still continue until the lower margin 602b.
  • Fig. 8 shows an image 802 which is printed on substrate 800 in print direction F.
  • the image 802 has an upper margin 802a and a lower margin 802b.
  • the image 802 may also be a print area of a particular color separation, e.g., as defined in block 422.
  • a turn-on phase (80 ms ⁇ 180 ms, for example) may be used to turn on the elements of the BID assembly 200. Before engagement, a time slot of about 70 ms may be waited. Approximately 50 ms may be waited for ink to arrive at the line "start of the image" 804b. 20 ms may be waited for stabilizing the voltages on the elements of the BID.
  • the developer roller 210 may be engaged to the photoreceptor 112 at location 204, but ink is not applied to the developer roller 210.
  • the latent image of the photoreceptor 1 12 which is in contact with location 204 corresponds to line "start engage" 804a.
  • the developer roller 210 may start rotating.
  • the first portion of ink arrives at the photoreceptor 1 12 in correspondence with (or just before) the upper margin 802a.
  • the angle between the locations 201 and 204 may be 184° and the time implied for this rotation may be 50.06 ms.
  • the length 804 in Fig. 8 may correspond (or be calculated on the basis of) to the arc (e.g., 184° in Table 1 ) between the locations 201 and 204.
  • the BID may be synchronized with the upper margin of the actual image to be printed.
  • Fig. 9 shows a method 950 for performing the BID cycle above. Accordingly, the upper margin of an actual image to be printed is calculated at step 952. At step 954, the operations of turning on and engaging the photoreceptor are performed so that ink development starts in correspondence to the upper margin 802a of the actual image 802 and not before.
  • a first queue 1010 may be defined.
  • the first queue 1010 may receive print job requests, e.g., by a user, which may use a geographical network (e.g., internet), a typographical application, and so on.
  • the print jobs in the first queue 1010 (which may be a first-in-first-out, FIFO, queue) may be transmitted to a second queue 1012.
  • the second queue 1012 may be internal to a memory device which is associated or part to the print controller 1 10, for example.
  • the print jobs in the second queue are processed to be printed, e.g., sequentially, if queue 1012 is a FIFO queue.
  • each print job may be processed at block 1014 (which may be implemented, for example, by the print controller 1 10).
  • a print job may be divided between color separations as in block 422 of Fig. 4.
  • margin calculations of a page of the print job, of an image of the print job, or of a print area for each color separation may be performed.
  • timing of the engagement and timing of the electric values to be imposed to the elements of the BID is defined.
  • the BID cycle is calculated.
  • the shut-off time limit may also be calculated.
  • results of the processes performed at block 1014 may be saved together with the other entries of the second queue 1012 and used for printing and developing ink.
  • the second queue 1012 may be avoided and the block 1014 may be directly transmitted to the print.
  • Fig. 1 1 shows a block scheme 1 100 in which a development cycle 1 104 of BID is determined on the basis of an input 1 102 which may comprise the length and/or of the margins of a substrate in which the image is to be printed or the size of the image or the area to be printed with the ink associated to the BID.
  • the block scheme 1 100 may be performed, for example, by implementing one of the methods 300, 300', 420, or 950, and may be obtained using at least one of the devices shown in Figs. 1 or 2.
  • the development cycle may therefore be reduced: a developer roller may be engaged to the photoreceptor for a limited time.
  • a photoreceptor may present a seam on its surface.
  • the presence of the seam may reduce the print quality. It is possible to avoid a seam with an engaging/disengaging movement of the developer roller. The probability of encountering seams is, notwithstanding, reduced. Therefore, less engaging/disengaging movements are implied.
  • the background phenomenon is due to the deposition of ink where it is not supposed to be. As the BID specifically operates where ink is to be applied, the occurrence of the background phenomenon is less probable. An accumulation of dry ink layer is also reduced. This accumulation tends, with time, to cause scratches in the photoreceptor. These scratches tend prevent ink from being placed in the intended position. However, in view of the reduction of the development cycle, this phenomenon is also reduced.
  • Fig. 12 shows a system 1200 which may be an example of the system controller 102.
  • the system 1200 may comprise a processor 1220 and a memory 1210 which contains executable instructions 1230 which, when executed by the processor 1220, causes the processor to perform at least one of the operations described above.
  • instructions 1230 may cause a timing of a development cycle of a binary ink developer, BID, on the basis of the length of a substrate or the size of an image or an area to be printed with the ink associated to the BID.
  • the processor 1220 may be connected, e.g., through an I/O device 1240, to a user interface 1270 and/or to a printer 1204.
  • the memory 1210 may contain a data space 1250 with data for the processor 1220.
  • the data space 1250 may contain information on timing a development cycle of a binary ink developer, BID, on the basis of the length of a substrate in which the image is to be printed or the size of the image or the area to be printed with the ink associated to the BID. Margin calculations and timing information may be stored in the memory 1210.
  • examples may be implemented in hardware.
  • the implementation may be performed using a digital storage medium, for example a floppy disk, a Digital Versatile Disc (DVD), a Blu-Ray Disc, a Compact Disc (CD), a Read-only Memory (ROM), a Programmable Read-only Memory (PROM), an Erasable and Programmable Read-only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM) or a FLASH memory, having electronically readable control signals stored thereon, which cooperate (or are capable of cooperating) with a programmable computer system such that the respective method is performed. Therefore, the digital storage medium may be computer readable.
  • DVD Digital Versatile Disc
  • CD Compact Disc
  • ROM Read-only Memory
  • PROM Programmable Read-only Memory
  • EPROM Erasable and Programmable Read-only Memory
  • EEPROM Electrically Erasable Programmable Read-Only Memory
  • FLASH memory having electronically readable control signals stored thereon, which cooperate (or are
  • Some examples comprise a data carrier having electronically readable control signals, which are capable of cooperating with a programmable computer system, such that one of the methods described herein is performed.
  • examples may be implemented as a computer program product with program instructions, the program instructions being operative for performing one of the methods when the computer program product runs on a computer.
  • the program instructions may for example be stored on a machine readable carrier.
  • an example of method is, therefore, a computer program having a program instructions for performing one of the methods described herein, when the computer program runs on a computer.
  • a further example of the methods is, therefore, a data carrier (or a digital storage medium, or a computer-readable medium) comprising, recorded thereon, the computer program for performing one of the methods described herein.
  • the data carrier, the digital storage medium or the recorded medium are tangible and/or non-transitionary, rather than signals which are intangible and transitory.
  • a further example of the method is, therefore, a data stream or a sequence of signals representing the computer program for performing one of the methods described herein.
  • the data stream or the sequence of signals may for example be transferred via a data communication connection, for example via the Internet.
  • a further example comprises a processing means, for example a computer, or a programmable logic device performing one ' of the methods described herein.
  • a further example comprises a computer having installed thereon the computer program for performing one of the methods described herein.
  • a further example comprises an apparatus or a system transferring (for example, electronically or optically) a computer program for performing one of the methods described herein to a receiver.
  • the receiver may, for example, be a computer, a mobile device, a memory device or the like.
  • the apparatus or system may, for example, comprise a file server for transferring the computer program to the receiver.
  • a programmable logic device for example a field programmable gate array
  • a field programmable gate array may cooperate with a microprocessor in order to perform one of the methods described herein.
  • the methods are preferably performed by any hardware apparatus.
  • the apparatus described herein may be implemented using a computer.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

Dans un exemple, un cycle de développement d'un développeur d'encre binaire, BID, est synchronisé. La synchronisation peut être basée sur la longueur d'un substrat sur lequel l'image doit être imprimée ou la taille de l'image ou de la zone à imprimer avec l'encre associée au BID.
PCT/EP2016/073528 2016-09-30 2016-09-30 Développement d'encre WO2018059721A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201680089758.4A CN109791387B (zh) 2016-09-30 2016-09-30 油墨显影
PCT/EP2016/073528 WO2018059721A1 (fr) 2016-09-30 2016-09-30 Développement d'encre
US16/332,965 US10649380B2 (en) 2016-09-30 2016-09-30 Ink development
US16/776,811 US10802435B2 (en) 2016-09-30 2020-01-30 Ink development

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2016/073528 WO2018059721A1 (fr) 2016-09-30 2016-09-30 Développement d'encre

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US16/332,965 A-371-Of-International US10649380B2 (en) 2016-09-30 2016-09-30 Ink development
US16/776,811 Continuation US10802435B2 (en) 2016-09-30 2020-01-30 Ink development

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WO2018059721A1 true WO2018059721A1 (fr) 2018-04-05

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6048358A (ja) * 1983-08-26 1985-03-16 Sharp Corp ペ−ジプリンタ
US20040105702A1 (en) * 2001-01-23 2004-06-03 Tsuneo Kurotori Liquid image formation apparatus and liquid developing device
US20090097883A1 (en) * 2007-10-15 2009-04-16 Guzman Marco A Liquid electro-photography printing device binary ink developer having suction cavities
US20120003015A1 (en) * 2010-06-30 2012-01-05 Brown Kenneth J Printing job with developer removal
WO2016015777A1 (fr) * 2014-07-31 2016-02-04 Hewlett-Packard Indigo B.V. Sections de développement pour presses d'impression numérique, dispositifs de commande et procédés

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5160969A (en) * 1989-06-26 1992-11-03 Ricoh Company, Ltd. Image forming apparatus having a separate black developer stored for a color image
US6122460A (en) 1999-12-02 2000-09-19 Lexmark International, Inc. Method and apparatus for automatically compensating a degradation of the charge roller voltage in a laser printer
JP2005077903A (ja) * 2003-09-02 2005-03-24 Casio Electronics Co Ltd カラー画像形成装置
KR100561416B1 (ko) * 2004-01-20 2006-03-16 삼성전자주식회사 습식 현상장치
JP4506345B2 (ja) * 2004-08-11 2010-07-21 富士ゼロックス株式会社 印刷制御装置、方法及びプログラム
JP4821372B2 (ja) * 2006-03-03 2011-11-24 富士ゼロックス株式会社 画像読み取り装置
CN101274553B (zh) * 2007-03-30 2010-06-23 兄弟工业株式会社 图像记录装置及图像记录方法
JP4725640B2 (ja) * 2008-12-16 2011-07-13 コニカミノルタビジネステクノロジーズ株式会社 画像形成装置
US8075129B2 (en) 2009-03-31 2011-12-13 Xerox Corporation System and method for optimizing printing throughput and print quality by evaluating image content
US8559831B2 (en) * 2009-11-13 2013-10-15 Eastman Kodak Company Sheet registration for a multipass electrophotographic printer
JP2012051346A (ja) 2010-09-03 2012-03-15 Toshiba Tec Corp 画像形成装置及び画像形成装置の画像形成方法
US10150285B2 (en) * 2012-11-13 2018-12-11 Hp Indigo B.V. Formation of a crease and an image on media
EP2951645A1 (fr) * 2013-01-29 2015-12-09 Hewlett-Packard Indigo B.V. Impression électrophotographique
US9823592B2 (en) * 2013-07-31 2017-11-21 Hewlett-Packard Development Company, L.P. Coated photoconductive substrate
US9678454B2 (en) 2013-09-06 2017-06-13 Hewlett-Packard Development Company, L.P. Liquid electrography printing
US10191416B2 (en) * 2014-08-08 2019-01-29 Hp Indigo B.V. Wet null cycle printing
JP6111463B2 (ja) 2014-10-30 2017-04-12 コニカミノルタ株式会社 画像形成装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6048358A (ja) * 1983-08-26 1985-03-16 Sharp Corp ペ−ジプリンタ
US20040105702A1 (en) * 2001-01-23 2004-06-03 Tsuneo Kurotori Liquid image formation apparatus and liquid developing device
US20090097883A1 (en) * 2007-10-15 2009-04-16 Guzman Marco A Liquid electro-photography printing device binary ink developer having suction cavities
US20120003015A1 (en) * 2010-06-30 2012-01-05 Brown Kenneth J Printing job with developer removal
WO2016015777A1 (fr) * 2014-07-31 2016-02-04 Hewlett-Packard Indigo B.V. Sections de développement pour presses d'impression numérique, dispositifs de commande et procédés

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CN109791387A (zh) 2019-05-21
US20190258198A1 (en) 2019-08-22
US20200166880A1 (en) 2020-05-28
US10802435B2 (en) 2020-10-13
CN109791387B (zh) 2021-10-12
US10649380B2 (en) 2020-05-12

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